Beginner - creating and calling functions

Hi!

I'm trying to create and call a function which converts Fahrenheit to Celsius; here's my code:

Code:

---

#include <stdio.h>

int fahrenheit_to_celsius(int f);


int main()
{
    printf(fahrenheit_to_celsius(5));
    return 0;
}


int fahrenheit_to_celsius(int f)
{
    int c;
   
    c = 5 * (f-32) / 9;
    return c;
}

---

When I compile and run, the program outputs nothing. Could someone tell me what's wrong with it please?

Thanks!

printf works with a format string. So you need to specify a format string such as:

Code:

---

printf("%d\n", fahrenheit_to_celsius(5));

---

but note that your calculation uses integer arithmetic, which probably isn't going to return you the result you might expect as integer division truncates. Consider if you want to compute with double values and return a double instead, in which case the format specifier would be %f rather than %d.

Thank you very much for the explanation!